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Long-Term Debt (Narrative) (Details)
9 Months Ended
Aug. 24, 2018
USD ($)
Mar. 21, 2018
USD ($)
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity $ 2,740,000   $ 2,740,000
Credit facility current borrowing capacity $ 3,000,000   3,000,000
Credit limit     $ 2,740,000
Prosperity Bank [Member]      
Debt Instrument [Line Items]      
Credit facility maturity date     Jul. 31, 2020
Rate above prime 0.50% 0.50%  
Interest rate 5.50% 5.00% 5.75%
Credit facility maximum borrowing capacity   $ 2,000,000 $ 50,000,000
Credit facility current borrowing capacity     3,000,000
Credit facility amount outstanding     0
Prosperity Bank [Member] | Loans And Letters Of Credit [Member]      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity     $ 50,000,000
Maximum [Member] | Prosperity Bank [Member]      
Debt Instrument [Line Items]      
Funded debt to EBITDA     3.5
Minimum [Member] | Prosperity Bank [Member]      
Debt Instrument [Line Items]      
Current ratio     1
Interest coverage     3.0